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牙齿变色的主要原因是由于血液进入髓室和不适当的治疗。假如变色是由于牙髓分解产物或产色菌引起的话,则死髓牙的漂白是可能的;如果是由于金属性的盐所引起的
The main cause of tooth discoloration is due to the blood entering the pulp chamber and improper treatment. Bleaching of dead pulp teeth is possible if discoloration is caused by dental pulp decomposition products or chromogens; if it is due to a metallic salt